# Relationship history for MSHA mine 1201999

Current hierarchy: **Keith P  Sullivan; Rick P  Sullivan → Navillus Aggregates, LLC → Liberty Center**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Lynn Woods Contracting → Liberty Center; 1987-04-01 to 1993-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Woods Lynn → Liberty Center; 1987-04-01 to 1993-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Woods Lynn → Lynn Woods Contracting; 1987-04-01 to 1993-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Allen L Poorman → Liberty Center; 1991-02-01 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Specialty Conveyance Services Inc → Liberty Center; 1993-07-26 to 1994-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Matson Mark → Liberty Center; 1993-07-26 to 1994-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Matson Mark → Specialty Conveyance Services Inc; 1993-07-26 to 1994-07-17; source msha-controller-operator-history
- **operator_operates_mine:** Old Prairie Products Inc → Liberty Center; 1994-07-18 to 2002-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Allen L Poorman → Old Prairie Products Inc; 1994-07-18 to 2002-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Rick P  Sullivan et al → Liberty Center; 1996-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Navillus Aggregates, LLC → Liberty Center; 2002-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick P  Sullivan et al → Navillus Aggregates, LLC; 2002-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith P  Sullivan et al → Navillus Aggregates, LLC; 2002-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bradley S Poorman et al → Liberty Center; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bradley S Poorman et al → Old Prairie Products Inc; 2021-01-01 to 2002-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Shelly M Poorman et al → Old Prairie Products Inc; 2021-01-01 to 2002-09-30; source msha-controller-operator-history